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The Effect of Gasoline Composition on Exhaust Emissions from Modern BMW Vehicles
ISSN: 0148-7191, e-ISSN: 2688-3627
Published October 01, 1994 by SAE International in United States
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In a cooperative programme between BMW and Shell, the effects of gasoline properties and composition on regulated emissions (HC, CO, NOx), CO2, fuel consumption and catalyst performance have been studied. The objective of the test programme was to investigate the effect of different hydrocarbon groups from typical refinery streams on exhaust emissions with a detailed analysis not only of the tailpipe emissions but also engine out emissions and catalyst performance. In total thirteen fuels with widely varying physical properties and chemical composition were evaluated in a 1991 series production BMW 525i, and a subset of three of these fuels in two other BMW models to verify their sensitivity to fuel quality.
The results for the BMW 525i showed that significant reductions in HC, CO and NOx emissions were seen for fuels containing splashblended oxygenates and with aromatics replaced by isoparaffins. Similar reductions in HC and CO emissions were seen in the other two vehicles, although the BMW 316i was somewhat less sensitive to fuel changes. It is not clear whether these reductions were due to chemical composition (i.e. MTBE and aromatics) or to associated changes in physical properties (i.e. fuel volatility). This important question will be addressed in the forthcoming European EPEFE programme (European Programme on Emissions Fuels and Engine Technologies). The effect of fuel quality on NOx emissions varied for the different vehicles. The MTBE-containing, high volatility, low aromatic fuel reduced emissions from the BMW 525i, had negligible effect on the BMW 316i but increased emissions from the BMW 740i. These varying effects can be explained in terms of specific engine/catalyst/lambda effects.
The fuel effects were shown to be partly due to changes in engine-out emissions, but more to changes in catalyst efficiency, especially over the EUDC part of the test cycle where emission rates are relatively low, but the greatest relative fuel effects were seen.
Catalyst rig tests with varying fuel sulphur content between 10 and 100 ppm showed no significant effect on the conversion efficiency of the current platinum/rhodium catalyst. However a prototype palladium based catalyst showed greater sensitivity to fuel sulphur. Chassis dynamometer tests on the BMW 525i with platinum/rhodium catalyst showed a reduction in NOx emissions when reducing fuel sulphur, but CO and HC emissions were unaffected.
The MTBE containing, volatile, low aromatics fuels gave small reductions in CO2 emissions within the repeatability of the experiment, but showed significant increases in volumetric fuel consumption.
|Technical Paper||European Programme on Emissions, Fuels and Engine Technologies (EPEFE) - Gasoline Aromatics/E100 Study|
|Technical Paper||Simultaneous Measurements of Driveability and Emissions at Cool Ambient Temperatures|
CitationLange, W., Müller, A., McArragher, J., and Schäfer, V., "The Effect of Gasoline Composition on Exhaust Emissions from Modern BMW Vehicles," SAE Technical Paper 941867, 1994, https://doi.org/10.4271/941867.
Gasoline: Composition and Additives to Meet the Performance and Emission Requirements of the Nineties
Number: SP-1054; Published: 1994-10-01
Number: SP-1054; Published: 1994-10-01
- Morgan, ID.B. et. al. „An integrated study of the effects of gasoline composition on exhaust emissions. Part 1, programme outline and results on regulated emissions.” SAE paper 932678
- Box, G.E.P. Hunter, W.G. Hunter, J.S. 1987 Statistics for experimenters New York Wiley
- Neter, J. Waserman, W. 1974 Applied linear statistical methods Homewood, Illinois Irwin
- Jessup, P.J et. al. „An overview of Unocal's low emission gasoline research programme” SAE paper 920801
- Gething, J.A. „Distillation adjustment: An innovative step to gasoline reformulation SAE paper 910382
- Quader, A. et. al. „Why gasoline 90% distillation temperature affects emissions with port fuel injection and premixed charge” SAE paper 912430
- European Programme on Emissions Fuels and Engine Technologies (EPEFE) Technical Task Force, First Quarterly Report January 1994 ACEA EUROPIA
- Hochhauser, A.H. et. al. „The effect of Aromatics, MTBE, Olefins and T90E on mass exhaust emissions from current and older vehicles - The Auto/Oil Air Quality Improvement Research Programme
- Harrington, J.A. et. al. „A single cylinder engine study of the effects of fuel type, fuel stoichiometry, and Hydrogen to Carbon ratio on CO, NO and HC exhaust emissions SAE paper 730476 1973
- Beckwith, P. et. al. „The effect of three way catalyst formulation on sulphur tolerance and emissions from gasoline fuelled vehicles” SAE paper 940310
- Le Jeune, A. McDonald, C.R. Lee, G.R. „NO x -Aromatics Effects in Catalyst-Equipped Gasoline Vehicles.” SAE paper 941869
- Bayerl, W. et. aL. „The effect of fuel composition on hydrocarbon emissions from gasoline engines MTZ 53 1992